4-{4-[(E)-(2-Hy­droxy­phen­yl)imino­methyl]phen­oxy}benzene-1,2-di­carbo­nitrile

The asymmetric unit of the title compound, C(21)H(13)N(3)O(2), contains two independent mol­ecules with a similar structure. In one mol­ecule, the central benzene ring is oriented with respect to the terminal benzene rings at 27.23 (7) and 67.96 (7)°; in the other mol­ecule, the corresponding dihedral angles are 12.42 (7) and 64.55 (7)°. In both molecules, there is a short O—H⋯N interaction involving the OH group and the adjacent N atom. In the crystal, there are O—H⋯N hydrogen bonds, and C—H⋯O and N—H⋯O interactions linking the molecules to form a three-dimensional network. π–π stacking between the pyridine and benzene rings and between the benzene rings [centroid–centroid distances = 3.989 (2), 3.705 (2) and 3.607 (2) Å] may further stabilize the structure. A weak C—H⋯π inter­action is present in the crystal.